Johor State Constitution (Malay: Undang-undang Tubuh Negeri Johor) is the state constitution of Johor, promulgated on 14 April 1895 by Sultan Abu Bakar. The contents of the constitution covers many aspects:

• The procedures for the selection and coronation of the Sultan of Johor, as well as the succession procedures
• The laws and responsibilities of the State Assembly, Executive Council (Exco) and their members
• Rules regarding to Islam as the official religion of Johor
• The development of the basics of legal punishments by justice courts
• International deals

Since 1895, the Johor State Establishment Constitution was revised 4 times:-

• First Revision (1 April 1908)
• Second Revision (17 September 1912)
• Third Revision (12 May 1914)
• Fourth Revision (17 July 1918)

Undang-undang Tubuh Negeri Johor is the first written constitution among the Malay states.^[1] Undang-undang Tubuh Negeri Johor played a major role for the Malays during their opposition against the formation of Malayan Union. The key factors of their protest were because all Sultans of Malay states would lose their power as the ruler of their respectable states, and the way Sir Harold MacMichael threatened the Sultans for their signatures.

Sultan Ibrahim of Johor himself was encouraged by MacMichael to sign on the treaty, sparking anger among Malays, claiming that signing the Malayan Union treaty violated the Undang-undang Tubuh Negeri Johor which disallowed the Sultan of Johor from performing actions that might threaten the sovereignty of Johor. As a response of the protest, he hosted the first UMNO's first general assembly at his palace in Johor Bahru in May 1946. He also joined the boycott of the installation of Malayan Union's first governor.

Due to the success of the Malayan Union protest by the Malays, rulers of other Malay states began using Undang-undang Tubuh Negeri Johor as a model for their own constitutions in order to protect the sovereignty of Malay states.